CN205297511U - Downhole Electric Heating Steam Generator - Google Patents

Abstract

The utility model provides an electrical heating steam generator in pit specifically contains: the oil pipe, the pump cylinder, the electric heating steam generator and the heating power spiral pipe; wherein the electrically heated steam generator comprises: the device comprises a hollow pipe, a cover, a shell upper cover plate, a shell lower cover plate and a shell; the generating device is sequentially connected with an oil pipe, a pump cylinder and a hollow pipe from top to bottom; the upper end of the cover cap is sleeved at the lower end of the oil pipe, and the lower end of the cover cap is connected with the upper end of the shell; a water filling port is arranged on the oil pipe between the upper end of the cover cap and the pump barrel; the cover cap and the shell are covered outside the pump cylinder and the heating power spiral pipe; the upper cover plate of the shell is arranged between the lower end of the cover cap and the upper end of the shell and is used for isolating the space in the cover cap from the space in the shell, and the upper cover plate of the shell is provided with a water inlet; the lower cover plate of the shell is arranged at the lower end of the shell and is provided with an air outlet; the heating power spiral pipe is wound outside the hollow pipe, one end of the heating power spiral pipe is connected with the water inlet, and the other end of the heating power spiral pipe is connected with the air outlet and used for converting the injected running water into hot steam.

Description

Downhole Electric Heating Steam Generator

technical field

The utility model relates to a downhole electric heating steam generator for thermal recovery of heavy oil, in particular suitable for downhole electric heating steam generator for steam huffing and puffing.

Background technique

For thermal recovery of heavy oil, steam dryness has always been the main bottleneck restricting steam huff and puff, steam flooding and SAGD. Since the 1970s, research and use of downhole steam generators have begun. At present, there are generally two types of downhole steam generators. One is the downhole fuel combustion steam generator with the same principle as the surface steam generator, including high-pressure combustion direct heat exchange type and low-pressure combustion indirect heat exchange type. At present, the more feasible high-pressure combustion direct heat exchange type Heat exchange type downhole steam generator, the second is downhole electric heating steam generator, there are three kinds of devices in the available literature, but none of them are suitable for steam stimulation.

The patent 201410040391.X downhole electric heating steam generator in the prior art is only suitable for steam flooding and SAGD. When steam huffing and puffing is used for steam injection and steam injection, the pore size is too small, so it is easy to block the flow of heavy oil into the tubing. At the same time, its straight-through electric heating The tubes are limited in fluid heating temperature due to the short distance. The two types of electric heating strings mentioned in the paper "Research on Downhole Electric Steam Generator Technology for Heavy Oil Thermal Recovery" are not suitable for steam huffing and puffing after soaking the well and blowing out directly. They can only be tripped and lowered to increase operating costs.

Utility model content

The purpose of the utility model is to provide a downhole electric heating steam generator suitable for steam huff and puff, improve the dryness of downhole steam, reduce environmental pollution, improve the utilization rate of steam injection, provide heat for the pumping stage, and increase the recovery rate of huff and puff to achieve production increase The purpose of increasing efficiency, energy saving and environmental protection.

In order to achieve the above purpose, the utility model specifically provides a downhole electric heating steam generating device, the generating device includes: an oil pipe, a pump barrel, an electric heating steam generator and a thermal spiral tube; wherein the electric heating steam generator includes: Hollow pipe, cover, casing upper cover, casing lower cover and casing; the generating device is connected with oil pipe, pump barrel and hollow pipe in sequence from top to bottom, and the crude oil is sent from the hollow pipe to the pump The upper end of the cover is sleeved on the lower end of the oil pipe, and the lower end of the cover is connected to the upper end of the casing; the oil pipe between the upper end of the cover and the pump barrel is provided with a water injection port for Inject running water; the cover and the housing cover are arranged on the outside of the pump cylinder and the heat spiral tube; the upper cover plate of the housing is arranged between the lower end of the cover and the upper end of the housing for The inner space of the cover is isolated from the inner space of the housing, the upper cover of the housing is provided with a water inlet; the lower cover of the housing is arranged at the lower end of the housing and the lower cover of the housing is provided with an outlet Air port; the thermal spiral tube is wound outside the hollow tube, one end of the thermal spiral tube is connected to the water inlet, and the other end is connected to the gas outlet, which is used to convert the injected water into hot steam.

In the above-mentioned downhole electric heating steam generating device, preferably, the generating device further includes a surface temperature and pressure real-time monitor, and the surface temperature and pressure real-time monitor is used to monitor wellhead temperature and/or wellhead pressure.

In the above-mentioned downhole electric heating steam generating device, preferably, the gas outlet of the thermal spiral tube is also provided with a thermocouple temperature sensor and/or a capillary pressure sensor; The real-time monitor is connected; the capillary pressure sensor is connected with the ground temperature and pressure real-time monitor through a pressure detection wire.

In the above-mentioned downhole electric heating steam generating device, preferably, the inside of the housing is a plurality of hollow tubes, the upper part of the hollow tube is connected with the pump cylinder, and the lower part is flush with the lower cover plate of the housing, which is used to Crude oil enters the pump barrel.

In the above-mentioned downhole electric heating steam generating device, preferably, the upper part of the hollow tube is in the shape of a bell mouth.

In the above-mentioned downhole electric heating steam generating device, preferably, the thermal spiral tube includes a plurality of spiral tubes, and a thermal resistance wire is wound outside the spiral tube, and the thermal resistance wire is connected to an external power supply for passing through a loop The thermal resistance wire is used to heat the flowing water in the spiral tube to generate hot steam.

In the above-mentioned downhole electric heating steam generating device, preferably, the water injection port includes a plurality of spring ports on the pump, and the spring ports on the pump are used to inject flowing water into the inside of the cover according to the water pressure.

In the above-mentioned downhole electric heating steam generating device, preferably, the upper spring port of the pump further includes: a joint panel is arranged outside the upper spring port of the pump, and the joint panel is used to close the spring port of the pump. The patching panel is connected to the cover through a spring, and when the water pressure in the hollow tube reaches a predetermined pressure, the patching panel is opened to allow flowing water to flow into the cover.

In the above-mentioned downhole electric heating steam generating device, preferably, the gas outlet of the heating coil is provided with a check valve to prevent crude oil from flowing into the heating coil.

The beneficial technical effect of the utility model lies in: solving the practical problems of low dryness of bottom steam huff and puff of steam in heavy oil reservoirs, heating of crude oil at the bottom of wellbore at the end of blowout and huff and puff, and improving rheology of crude oil. The device adopts one-time injection-production pipe string, which reduces the manpower, material resources and capital generated by the periodic injection of steam injection pipe string and production pipe string. It has the advantages of high thermal efficiency, less air pollution, and simple supporting equipment.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the utility model, constitute a part of the application, and do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is the structural representation of the downhole electric heating steam generating device provided by the utility model;

Fig. 2 is the schematic diagram of the upper cover plate of the downhole electric heating steam generating device provided by the utility model;

Fig. 3 is the schematic diagram of the lower cover plate of the downhole electric heating steam generating device provided by the utility model;

Fig. 4 is a side view of the spring port on the pump of the downhole electric heating steam generating device provided by the utility model;

Fig. 5 is a plan view of the spring port on the pump of the downhole electric heating steam generating device provided by the utility model;

Reference number

1-ground pumping system, 2-ground power supply system, 3-ground temperature and pressure tester, 4-cable, 5-double core temperature and pressure monitoring wire, 6-oil pipe, 7-casing, 8-pump barrel, 9- The valve under the pump, 10-the upper spring port of the pump, 11-the connecting bolt between the pump and the steam generator, 12-the cover, 13-the bell mouth, 14-the shell, 15-the hollow tube, 16-the spiral tube A, 17- Spiral tube B, 18-heating resistance wire, 19-water inlet A, 20-water inlet B, 21-air outlet A, 22-air outlet B, 23-temperature sensor, 24-pressure sensor, 25-top cover, 26-lower cover plate, 27-middle baffle plate, 28-packer

detailed description

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention more clear, the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiment of the utility model and its description are used to explain the utility model, but not as a limitation to the utility model.

Please refer to Fig. 1, the utility model specifically provides a downhole electric heating steam generating device, the generating device includes: an oil pipe 6, a pump barrel 8, an electric heating steam generator and a thermal spiral tube 16, 17; The electric heating steam generator includes: a hollow tube 15, a cover 12, an upper cover plate 25 of the housing, a lower cover plate 26 of the housing and a housing 14; and the hollow pipe 15, the crude oil is extracted from the hollow pipe 15 to the pump barrel 8 to the oil pipe 6; the upper end of the cover 12 is sleeved on the lower end of the oil pipe 6, and the lower end of the cover 12 is connected to the upper end of the casing 14 ; The oil pipe 6 between the upper end of the cover 12 and the pump barrel 8 is provided with a water injection port for injecting running water; 16, 17 outside; the upper cover plate 25 of the housing 14 is arranged between the lower end of the cover 12 and the upper end of the housing 14 for connecting the inner space of the cover 12 and the inner space of the housing 14 Isolation, the upper cover plate 25 of the housing 14 is provided with water inlets 19, 20; the lower cover plate 26 of the housing 14 is arranged at the lower end of the housing 14 and the lower cover plate 26 of the housing 14 is provided with an air outlet 21, 22; the thermal spiral tubes 16, 17 are wound around the outside of the hollow tube 15, one end of the thermal spiral tubes 16, 17 is connected to the water inlet 19, 20, and the other end is connected to the air outlet 21 and 22 are connected, and are used to convert the injected flowing water into hot steam.

In the above embodiment, the downhole electric heating steam generating device is provided with a casing 7 and a packer 28, and the operation of the downhole electric heating steam generating device is effectively protected by the casing 7 and the packer 28 , preventing unnecessary wear and corrosion of the downhole electric heating steam generating device.

In the above-mentioned downhole electric heating steam generating device, the generating device also includes a ground pumping system 1, a ground power supply system 2 and a ground temperature and pressure real-time monitor 3, and the ground pumping system 1 is used to extract crude oil or inject flowing water, The ground power supply system 2 is used to provide electric energy for the downhole electric heating steam generator, and the ground temperature and pressure real-time monitor 3 is used to monitor wellhead temperature and/or wellhead pressure.

Please refer to Fig. 1 again, in the above-mentioned downhole electric heating steam generating device, the gas outlets 21, 22 connected by the thermal coils 16, 17 are also provided with a thermocouple temperature sensor 23 and/or a capillary pressure sensor 24; The thermocouple temperature sensor 23 is connected to the ground temperature and pressure real-time monitor 3 through a temperature detection wire 5 ; the capillary pressure sensor 24 is connected to the ground temperature and pressure real-time monitor 3 through a pressure detection wire 5 .

Please refer to Fig. 1 and Fig. 2, the specific structure of the upper cover plate is shown in Fig. 2, a plurality of apertures are arranged on the upper cover plate, specifically including the steam generator upper cover 12 and water inlets 19, 20 , wherein the water inlets 19, 20 are respectively connected to the thermal spiral tubes 16, 17; those skilled in the art should know that the number of the water inlets is set to be the same as the number of the thermal spiral tubes, therefore, the utility model here There is no limit to the number of water inlets.

Please refer to Fig. 1 and shown in Fig. 3, described lower cover plate concrete structure as shown in Fig. 3, on this lower cover plate, be provided with hollow pipe 15 inlet and outlet, gas outlet 21, 22 and thermocouple temperature sensor 23 and capillary tube Pressure sensor 24; wherein said thermocouple temperature sensor 23 and capillary pressure sensor 24 can be selected to set one or both of them according to actual needs, and its specific position can also be selected according to the actual situation, and the utility model is not limited here; Since the number of the air outlets is the same as the number of the water inlets, they both change according to the number of the thermal coils, therefore, the present invention does not limit the number of air ports here.

In a preferred embodiment of the present invention, the inside of the housing 14 is a plurality of hollow tubes 15, the upper part of the hollow tubes 15 is connected to the pump barrel 8, and the lower part is flush with the lower cover plate 26 of the housing 14 , used to input crude oil into the pump barrel 8. The upper part of the hollow tube 15 is bell-shaped. The thermal spiral tubes 16, 17 include a plurality of spiral tubes, and the spiral tubes 16, 17 are wound with thermal resistance wires, and the thermal resistance wires are connected to an external power supply, such as the ground power supply system 2 through a cable 4. The thermal resistance wire heats the water flowing in the spiral tubes 16 and 17 through the circuit to generate hot steam.

Please refer to Fig. 1, Fig. 4 and Fig. 5. In the above embodiment, the water injection port includes a plurality of spring ports 10 on the pump, and the spring ports 10 on the pump are used to charge the cover according to the water pressure. 12 Inject running water inside. The spring port 10 on the pump also includes: a patch panel 103 is arranged outside the spring port 10 on the pump, and the patch panel 103 is used to close the spring port 10 on the pump, and the patch panel 103 and The cover 12 is connected by a spring 102 , and when the water pressure in the hollow tube 15 reaches a predetermined pressure, the joint panel 103 is opened to allow the water to flow into the cover 12 . As shown in Figure 4, the left side is the cover 12 and the right side is the oil pipe 6. In the initial state, the patching panel 103 is attached to the aperture of the water injection port of the oil pipe 6. When the water pressure in the oil pipe 6 reaches a predetermined When the pressure is high, the spring 102 and the patch panel 103 are flushed away by water pressure, so that the flowing water in the oil pipe 6 can flow into the cover 12. The planar structure of the spring port on the pump is shown in FIG. 5 .

In a preferred embodiment of the present invention, the gas outlet of the thermal coil is provided with a check valve to prevent crude oil from flowing into the thermal coil 16, 17, and the check valve is a common one-way valve.

Therefore, the utility model solves the practical problems of low steam huff and puff bottom steam dryness in heavy oil reservoirs, heating the crude oil at the bottom of the wellbore at the end of blowout and huff and puff, and improving the rheology of crude oil through the above-mentioned downhole electric heating steam generator. The device adopts one-time injection-production pipe string, which reduces the manpower, material resources and capital generated by the periodic injection of steam injection pipe string and production pipe string. It has the advantages of high thermal efficiency, less air pollution, and simple supporting equipment.

In order to more clearly illustrate the downhole electric heating steam generating device provided by the utility model, the specific structure of the downhole electric heating steam generating device will be further explained below with an example in actual work:

The underground electric heating steam generator device suitable for steam throughput provided by the utility model can be specifically composed of a ground pumping system 1, a ground power supply system 2, a ground temperature and pressure tester 3, a cable 4, a double-core temperature and pressure monitoring wire 5, a pump Cylinder 8, pump upper spring port 10, pump and steam generator connecting bolt 11, steam generator upper cover 12, bell mouth 13, shell 14, hollow tube 15, spiral tube A16, spiral tube B16, heating resistance wire 18. Water injection inlet A19, water injection inlet B20, steam outlet A21, steam outlet B22, temperature sensor 23, pressure sensor 24, shell upper cover plate 25, shell lower cover plate 26, and several groups of mid-baffle plates 27. Please refer to Figure 1, Figure 2 and Figure 3.

During installation: First, install the downhole electric heating steam generator. A resistance wire will be used to spirally wind the thermal coil A from the top, to the lower part, to the lower part of the thermal coil B, to wind upwards, to the upper part together, to connect with the cable 4, and to add waterproof insulator and armor. A mid-baffle plate is inserted between the two sets of spiral tubes to play a fixing role. Put the spiral tube and the middle baffle into the hollow annular shell, install the upper baffle on the upper part, and install the upper and lower baffles on the lower part. The lower circumference of the bell mouth is welded to the upper circumference of the hollow pipe, and the upper part of the bell mouth is welded to the lower part of the pump barrel by bolts. The pump barrel is connected to the oil pipe, and a hole is drilled on both sides of the oil pipe 1m above the pump barrel for the water injection channel. A spring is added to the hole, which opens when there is a certain pressure and closes when the pressure is low. The lower part of the upper cover of the steam generator is welded with the outer circumference of the upper part of the housing, and the upper part of the upper cover of the steam generator is welded with the outer wall circumference of the oil pipe 6 at the top of the spring water injection hole.

Then, add waterproof and anti-electric insulator and armor to the cable; secondly, go downhole to electrically heat the steam generator, pump barrel and the first oil pipe, and fix the cable and temperature-pressure twin-core wire on the oil pipe with clips, one section at a time A clip under the oil pipe fixes the cable and the temperature-pressure double-core wire on the oil pipe; moreover, a high-temperature-resistant metal packer is installed downhole. Finally, connect the cable to the motor, and connect the temperature and pressure twin-core wire to the ground temperature and pressure tester.

During steam injection: water enters the oil pipe 6 from the surface pump injection system, and the valve 9 under the pump is closed. Water enters the two water injection inlets 20 and 21 on the upper cover plate 25 of the steam generator shell from the spring port 10 on the pump through the upper cover 12 of the steam generator, and passes through the heating coil A and the heating coil B through electric heating so that the flowing water The temperature rises while flowing, and enters the formation from the two steam outlets 21 and 22 of the lower cover plate of the steam generator casing. There is a temperature and pressure sensor at the steam outlet of the lower cover of the steam generator shell, and the temperature and pressure data are transmitted to the ground voltage stabilization detector in real time through the double-core wire to control the pressure and temperature of the steam entering the formation in real time; the pressure is controlled by the ground pump Note that the pressure of equipment 1 is controlled, and the temperature is controlled by the power of ground power supply equipment 2.

When the well is stewed: stop the ground pumping system 1 for water injection, and turn off the ground power supply equipment 2.

When spraying: the crude oil is extracted from the pump cylinder 8 and oil pipe 6 to the ground through the hollow pipe 15, the two steam outlets 21 and 22 are closed due to the downward check valve, and the spring ports 10 on the two pumps are closed due to the low pressure .

When turning to pumping: Lower the plunger and sucker rod to carry out normal mining of the pumping unit.

Therefore, the utility model provides a downhole electric heating steam generator device suitable for steam huffing and puffing, which solves the problem of low dryness of the bottom steam of steam huffing and puffing in heavy oil reservoirs, heating the crude oil at the bottom of the wellbore at the end of blowout and huffing and puffing, and improving the efficiency of crude oil A practical matter of rheology. The device adopts one-time injection-production pipe string, which reduces the manpower, material resources and capital generated by the periodic injection of steam injection pipe string and production pipe string. It has the advantages of high thermal efficiency, less air pollution, and simple supporting equipment.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present utility model in detail. Within the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (9)

1. a downhole electric heating steam raising plant, is characterized in that, described generating means comprises: oil pipe, pumpCylinder, electric heating steam generator and heating power helix tube;

Wherein said electric heating steam generator comprises: hollow tube, cover cap, case top lid plate, housing lower cover and shellBody;

Described generating means is connected with oil pipe, pump barrel and hollow tube from top to down in turn, crude oil by hollow tube to described pumpCylinder to oil pipe is extracted out;

Described cover cap upper end is sheathed on oil pipe lower end, and described cover cap lower end is connected with described housing upper end;

On oil pipe between described cover cap upper end and described pump barrel, be provided with water filling port, for injecting flowing water;

Described cover cap and described case cover are located at pump barrel and heating power helix tube outside;

Described case top lid plate is arranged between described cover cap lower end and described housing upper end, for by empty in described cover capBetween and the isolation of described shell intracorporeal space, described case top lid plate is provided with water inlet;

Described housing lower cover is arranged at described housing lower end and described housing lower cover is provided with gas outlet;

Described heating power helix tube is set around described hollow tube outside, described heating power helix tube one end and described water inlet phaseConnect, the other end and described gas outlet join, and for providing, the flowing water of injection are converted into vapours.

2. downhole electric heating steam raising plant according to claim 1, is characterized in that, described dressPut and also comprise ground temperature and pressure real-time monitor, described ground temperature and pressure real-time monitor is used for monitoring wellhead temperature and/or wellMouth pressure.

3. downhole electric heating steam raising plant according to claim 2, is characterized in that, described heating power spiral shellCoil gas outlet is also provided with thermocouple temperature sensor and/or capillary pressure sensor;

Described thermocouple temperature sensor is connected with described ground temperature and pressure real-time monitor by temperature detection wire;

Described capillary pressure sensor is connected with described ground temperature and pressure real-time monitor by pressure detecting wire.

4. downhole electric heating steam raising plant according to claim 1, is characterized in that, in described housingPortion is multiple hollow tubes, and described hollow tube top and pump barrel join, and bottom flushes with housing lower cover, for by crude oilInput pump barrel.

5. downhole electric heating steam raising plant according to claim 1, is characterized in that, described hollow tubeTop is bell mouth shape.

6. downhole electric heating steam raising plant according to claim 1, is characterized in that, described heating power spiral shellCoil comprises many helix tubes, and outer winding of described helix tube is provided with hot water radiation wire, described hot water radiation wire and external power sourceBe connected, produce vapours for make described hot water radiation wire heat flowing water in described helix tube by loop.

7. downhole electric heating steam raising plant according to claim 1, is characterized in that, described water filling portComprise multiple pump upper spring mouths, described pump upper spring mouth is for injecting flowing water according to hydraulic pressure to described cover cap inside.

8. downhole electric heating steam raising plant according to claim 7, is characterized in that, bullet on described pumpSpring mouth also comprises: described pump upper spring mouth is outside equipped with a repaired mouth panel, and described repaired mouth panel is used for sealing described pumpSpring mouth, described repaired mouth panel is connected by spring with described cover cap, when flowing water hydraulic pressure in described hollow tube arrives predeterminedWhen pressure, open described repaired mouth panel, make flowing water inject described cover cap inside.

9. downhole electric heating steam raising plant according to claim 1, is characterized in that, described heating power spiral shellCoil gas outlet is provided with ball-and-seat, in order to stop crude oil to flow into described heating power helix tube.